A visual dynamic fluid loss and drainage simulation device and simulation method for fracturing fluid in tight gas reservoirs

Abstract

The invention discloses a visualized dynamic filtration loss and discharge and mining simulation device and simulation method for tight gas reservoir fracturing fluid. The simulation device comprisesa fracture-developed core visualized holder, a fracture morphology controller, a filtrate collection and post-compaction discharge and mining simulator, wherein a square core is arranged in the fracture-developed core visualized holder and has a core crack inside; visualized windows are arranged on the upper side and lower side of the fracture-developed core visualized holder; the fracture morphology controller comprises crack control screwing-in rods and a filtrate collection cushion block; and the filtrate collection and post-compaction discharge and mining simulator comprises a filtrate collection part and a post-compaction discharge and mining simulation part which are connected to center filtrate guide rods of the crack control screwing-in rods through gas-liquid circulating pipelines. The simulation device can adjust and control the angle and opening of a real fracture, and is conductive to researching the dynamic filtration loss law of fractures in unconventional tight gas reservoirs such as shale gas and coalbed methane. The simulation device simulates the long-period discharge and mining process, and is conductive to researching the discharge, mining and development law ofthe unconventional tight gas reservoirs such as the shale gas and coalbed methane after fracturing measures are implemented.

Description

technical field [0001] The invention relates to a visual dynamic filtration and drainage simulation device and simulation method of fracturing fluid in tight gas reservoirs, and belongs to the technical field of stimulation, reconstruction and drainage of tight gas reservoirs such as shale gas and coalbed methane. Background technique [0002] The global tight gas reservoirs are rich in reserves, and the scale of development continues to expand. As important types of tight gas reservoirs, shale gas reservoirs and coalbed methane reservoirs have been developed and utilized rapidly, and their role and status in global oil and gas production have been continuously improved. However, tight gas reservoirs have the characteristics of low porosity and low permeability, few natural fractures, and large gas-phase seepage resistance, which determines that fracturing stimulation is an inevitable choice for the efficient development of such tight gas reservoirs. With the continuous dev...

AI Technical Summary

Problems solved by technology

First, the existing dynamic filtration devices cannot accurately simulate real fractures. The roughness of simulated fractures and real fracture walls is very different, and real fractures have different angles and openings; second, the existing dynamic filtration devices The simulation of the long-period drainage after the dynamic fluid loss of the fracturing fluid is not considered in the lost device, so it is difficult to optimize the follow-up drainage plan

Third, the traditional dynamic fluid loss instrument does not realize the visual observation of the flow state of the fracturing fluid and the formation of the filter cake in the fracture, so it is impossible to grasp the real-time information of the fracture, which is not conducive to the study of the dynamic fluid loss law of the fracturing fluid

Although the dynamic fluid loss test of fracturing fluid has been realized, the fractures in this device are quite different from the real fractures in tight gas reservoirs, and cannot accurately reflect the dynamic fluid loss law of fracturing fluid in real fractures. Long-term drainage after filtration

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